Collapsible mold.



E. QUISUMBING.

COLLAPSIBLE MOLD.

APPLICATION FILED DEC.30. 191s.

mema Nov. 6, 1917 2 SHEETS-SHEET l.

1 1NVEN'EOR E. qulsumsmei OLLAPSIBLE MOLD.

APPLICATION FILED DEC.30, l9l6.

1,245,618. Patented Nov 6, 1917,

2 SHEETSSHEET 2- WiTNE ATTdR N EY EMILIO QUISUMBING, OE MANILA, PHILIIPINE ISLANDS.

COLLAPSIBLE MOLD.

Application filed December 30, 1916. Serial No. 139,796.

To all whom it may concern."

Be it known that I, EMILIO QtnsUMBING, a citizen of the Philippine Islands, residing at Manila, Philippine Islands, have in-' vented certain new and useful Improvements in Collapsible Molds, of which the following is a specification.-

This invention relates to collapsible molds, and more particularly to a mold adapted to be used in concretework for constructing cylindrical pipes, drains, and similar structures.

One of the main objects of the invention is to provide a mold of the character stated composed of a plurality of sections which may be quickly and easily assembled or disassembled. A further object is to provide a mold which may be disassembled or collapsed without the necessity of removing bolts, rivets, or other securing elements. A

still further object is to provide a mold composed of a plurality of interchangeable members, so that, in using, no delay or difiiculty will be incurred incident to the necessity of ascertaining that each member is in its proper position. Further objects will appear from the detailed description.

In the drawings;

Figure 1 is an end view of the mold in assembled condition;

Fig. 2 is a side view;

Fig. 3 is a section taken on line 33 of Fig. 2;

Fig. 4 is a longitudinal central vertical section through the mold;

Fig. 5 is a detailed perspective view of one of the mold sections;

Fig. 6 is a fragmentary detailed sectional view of a mold in a drain pipe illustrating the method of removing the mold;

Fig. 7 is a detail of a block to be used in connection with structures where two or more adjacent molds are utilized.

The mold is of cylindrical shape, and is composed of a plurality of prismoidal sections or members 1. Each of the sections 1 is composed of an end plate 2, a center plate 3, and a reduced end plate 4. Each of these plates is of prismoidal sectoral shape, and the section tapers in width from plate 2 to plate 4. All of the sections 1 are of the same construction and are arranged, when the mold is assembled, with their smaller ends oppositely disposed, alternately. Each of these sections is provided with a sheet metal covering 5 which is secured to the longitudinally extending bars 6 secured to' the plates 2, and 4. A central'bracing bar 7 is also secured to the inner ends of the plates. This provides a strong and rigid,

but very light structure. The bars 6 and 7 are set into the plates so that each section is free of all projections and is adapted to slide easily into or out of position.

In using the mold, the sections 1 are first Specification of'Letters Patent. Patented N 6 1917,

assembled so as to provide a cylindrical" structure, as shown in Fig. 1 of the'draw- ,ings. This structure is then mounted be-:

tween uprights 8 and is held in position by spacing blocks 9. The concrete mixture is then poured about the mold and tamped in the usual Ymanner, after whichit is allowed to set. When the concrete has set suffici ently, the lower section of the mold is re moved by pulling it outward longitudinally. This section slides easily out of engagement with the other sections, due to the fact that it is tapered oppositely thereto. Then the lower section of the mold has been withdrawn, the other sections are quickly and easily disassembled, thus rendering it possible to remove the entire mold from the structure without the necessity of a workman entering the mold and disconnecting bolts, or other securing elements, as is the common practice where molds of the ordinary construction are used. As will be noted, each. of the sections 2 is of truncated sectoral shape in cross section. This provides an opening 10 at the center of the mold, when the mold is assembled. This opening renders it possible for a person to grip the outer end plate of the lower section of the mold so as to withdraw this section and disassemble the mold.

In some cases, where drains or pipes of relatively great length are being molded, it is often desirable to use a form made up of a plurality of mold sections. For this purpose I provide a tapered block 11 provided with the strap 12, shown in Fig. 7 of the drawings. In structures of this sort the molds are placed with their ends or heads closely adjacent, and the block 11 is placed above the abutting ends of the molds. When the concrete is set, the block 11 is removed thus leaving a tapered opening 13 above and closely adjacent the end of the inner mold 14. A suitable bar 15 may be inserted through this opening into the opening 10 of the mold so as to loosen the lower section of the mold thus permitting it 00 be Withdrawn from the structure. Of course, if desired, the person using the mold can insert his arm through the opening for the same pur pose, or a hook rod may be provided which can be inserted through the opening 10 of the mold from the end of the pipe or other structure.

In using this mold the outer surface thereof will be coated With a heavy oil or grease, or may be coated With a soap-solution, in the usual manner, to prevent the cement from adhering to the surface of the mold, thus insuring that the mold can be easily collapsed and removed from the structure.

By my invention 1 have provided a mold of simple construction and operation which consists of a plurality of slidably connected elements or sections these sections being interchangeable and so mounted as to be quickly and easily disassembled Without the necessity of releasing bolts or similar securing elements A mold constructed in this manner is especially adapted for use in connection With structures of relatively small size, such as drains 01": 18 inches and less in diameter, into Which it Would be extremely Copies 01 this patent may be obtained for dih'ieult for a person to enter in order to release or collapse a mold.

lVhat I claim is:

1. A mold composed of a plurality of slidably connected alternately and oppositely tapered interchangeable sections of prismoidal shape, each of said sections being of frustosectoral shape in cross section.

2. A mold composed of a plurality of slidably connected prismoidal sections,each-of said sections being provided With end plates at each end, one of said plates being larger than the other, whereby each end of the mold is closed for the greater part of its area, a central opening being left for the insertion of a tool for collapsing the mold, said end plates providing members adapted to be engaged by a tool so as to permit the sections of the mold to be removed.

In testimony whereof I afiiXmy signature in presence of two Witnesses.

EMILIO QUISUMBING.

W itnesses JULIO FRANCIA, SANTIAGO ARTIAGA.

five cents each, by addressing the Commissioner 0! Patents, washihgtomC. 

